Internal-expanding brake



E. A. HARDISON INTERNAL EXPANDING BRAKE Feb. 7, 1928.

2 Sheets-Sheet 1 Filed Dec, 24. 1925 v 1,658,288 E. A. HARDISON INTERNAL EXPANDING BRAKE Filed Dec. 24, 1925 2 Sheets-Sheet 2 Feb. 7, 1928.

INVENTOR. Eon m1 fill/4190mm BY WW 4. I I/V,

llllllllll ATTQRNEYS.

si mes PATENTOFI "ICE 1h. KJQRDIEGH, 015 LOS Ahiiil ifih'fi CALIFORNIA, ASSIGNOB, OF ONE-FOURTH TO 3 Iii. .M'JELLEE, AND @NE-XUUR-TH TO ERVIN D. STUART, BOTH OF SANTA.

INTEENAL'EXPANDING ems.

Awiicaticn fllcfl December 24, 925. Serial No. 77,534.

hivenhion relates to internal ems-chafing brakes particularly acieyteoi although nee necessoifiiy for motor vehicles.

ose of my ime ition is to prosiie espousing brake in which the pshle of beiiug expended uniformly so sari so as to have uniform brokmeiii, with the hsohe 51mm end to of; meizimum hi' eicizig section wish so more em a uiiii orm 'Weeriiig oi r, i purpose of my invention to of i extremely simp ie midi inexowfscture and essemhle, and s -L h.- ch mechanism for actuating his heieii cm; be operated with. minin effort and the her i6. easily maintained v expaiicieci position.

T is

expanding brake en'ihoeiying my invention,

- and will then poise out the novei ieaiures thereof in claims in the drawings:

Figures 1 and 2 are views showing in side elevation form of brake embodying my invention and the brake being shown in rcieeseci and applied position, respectively, in Figures 1 and 2;

Figure 3 is a sectional View taken on the line 33 of Figure 1;

Figure 2 a sectional vies/ taken on the iine fr-ii of. Figure l;

Figure 5 is a fragmentary sectional view when oii'iihe iiiie 5-5 of Figure 1.

' .niies reference characters refer to simi Referyhig specifically to the chewing, inveiioii in its present embodiment compri, c iii-eke drum of conventional form secured to a vehicle Wheel 16 having a huh 1? provided with bearings 18 in which an axle 19 is journeied. The axle 19111213 consiiiziiiie' she rear or driving axle of a motor vehicle", she as shown is projected from a housing 20 to which latter is secured a disk can hog the brake mechanism.

'lihe iiifc'ke mechanism comprises a band 22 fences? of? resilient metal, such as steel or u and oo'rmeily concentric within the with its medial portion provideii e1 im e, bracket 23 siidabi eicggsgmg pin 24 mounted m the k 21 and o shove desoriheii char- 1, x

which operates to positively g hie the describe only one formof internal the views of the drewsecured therein by means of a nut 25. The free code of the band, 22 have secured there to 2:. pair of companion block members 26, bhe

confronting sides of which are constructed heqge inits horizontal movement and to also limit the movement of the wedge in either direction. The pin is secureci in the disk 21 by means of as out 32.

' The Wedge or expanding member 28 is shown. es formesi integral with s yoke 33 constructed no accommodste the axle 19 end yet show of the necessary movement of the e);- pending member without the yoke en eging the axle. The yoke 33 is constmicbea Wish teeth 34 to form *4 rock which is constantly cngegefi by a pinion 35 formed on the inner end ofe stub side 35 having on angular PG!"- tion 36 on which letter is secured an operating arm 37, by means of s nut 38. This operating arm 37 is adapted to be connected through any suitable mechanism (not shown) with the brake pedal that, by depression of the latter the'hrm will he actuated to .i'otsie the stub shaft 38 andthrough the medium of the reek 3}; to setuetc the yoke and hence the expanding mem ber 28.

, A. pair of links 3% are piyoteily mounted on studs 40 secured to the disk 21 at oppositesiiies of the'yoke 33, and these iinks are also pivotaiiy connected by means of stucis 41 to the companion biock members 26. These links 39 are designed to control the expanding movement oi the block member's 26 end. hence the expanding movement of the hand 22, which latter carries the usual liner 42.

In the operation of the brake, the. several parts occupy the positions shown in Figure 1 when the brake is in released position, the expanding member 28 being part1 drawn from between the block mom ers 26 so that the orakehaud 22 is substantiail concentric to emdvout of engagementmt she inner periphery of the To anof a motor vehicle so with ply the brake the operating arm 37 is actuated to advancet-he' yoke 33 from the position shown in l igure 1 to that shown in Figure 2, whereby the expanding member '28 is moved inwardly between the block members 26. thereby starting the latter so as to cause an outward movement of the ends of the brake band. During this movement of the block members the links 39, because of their mounting and connection with the block members, so control the movement of the latter as to effect an expansion of the brake band uniformly from end to end, the

intermediate portion of the band being supported 1n its outward or expanding movement by the guiding bracket pin. With the band expanded uniformly as described, it will be manifest that the liner 42 engages the drum 24 with uniform pressure throughout its entire length, thereby securing maximum braking action.

To release the brake, it is only necessary to move the lever 37 in the opposite direction to effect a retraction or rearward movement of the expanding member 28 when the block members 26, under the inherent contracting action of the brake band are returned to normal position, and the liner will, as a result, disengage the brake drum. It -is to be particularly noted that the surfaces '27 of the block members 26 are slightly curved or rounded longitudinally so as to insure of the proper sliding engagement of the expanding member with the block members and in a manner to prevent possible binding of the two.

Although I have herein shown and described only one form of internal expanding brake embodying my invention. it is to be understood that various changes and modifications may be made therein without departing from the spirit of the invention, and the spirit and scope of the appended claims.

I claim:

-1. A brake comprising a drum, a stationary disk, a resilient band within the drum,

a bracket and pin supporting the intermediate portion of the band for movement,

companion block members secured to the ends of the band and having converging surfaces, links pivotally connected to the book members and to said disk, an expanding member of wedge form engaging the converging surfaces of the block members, a pin and slot connection between the disk and the expandingmei'nber for guiding-the latter in its movement, a yoke secured to the expanding member, a rack on the yoke, and a pinion rotatably mounted in the disk and engaging the rack,

A. brake comprising a drum, a band of flexible material Within the drum and normally disengaging the latter, companion Wedge members carried by the band, an expanding Wedge member movable between the first members, and means for actuating the expanding member to cause the first member to expand said band and comprising a yoke connected to the expanding memher, a rack on the yoke, and a rotatable pinion engaging the rack 3. A brake eonnrising a drum, a band of flexible material within the drum and normally disengaging the latter, companion wedge members carried by the band, an eX- panding wedge member movable between the first members, means for actuating the expanding member to cause the first memher to expand said band and comprising a yoke connected to the expanding member, a rack on the yoke, and a rotatable pinion engaging the rack, and means associated with the first menibersto controlthe movement thereof when expanded by the expanding member to cause expansion of the band uniformly from end to end.

4. A brake comprising a drum, :1 band of flexible material within the drain and normally disengaging the latter, companion wedge members carried by the band, an expanding wedge member movabiy mounted between the first members. and rack and gear means for actuating the expanding: member to cause the first niei'nbers to pand said band.

EDWIN 'A. HARDISON. 

